HOW: Holding a ball with both hands, shift your weight to one leg to balance on just that leg. Hinge forward at the hips, kick the other leg behind you as you rotate your upper half towards the balancing leg and tap the ball to the ground. Return to the starting position and repeat.
FEEL: You should feel your lower leg muscles working as well as a stretch in your low back muscles.
COMPENSATION: Keep a slight bend in the knee balancing so you can attempt to touch the ball to the ground. Keep your hips facing forward.